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Acetylcholinesterase in neuroblastoma and neuroblastoma × glioma hybrid cells: Cellular localization and molecular forms
Author(s) -
Melone M. A. R.,
Longo A.,
Taddei C.,
AugustiTocco G.
Publication year - 1987
Publication title -
international journal of developmental neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.761
H-Index - 88
eISSN - 1873-474X
pISSN - 0736-5748
DOI - 10.1016/0736-5748(87)90019-0
Subject(s) - acetylcholinesterase , neuroblastoma , aché , intracellular , cell culture , biology , enzyme , secretion , microbiology and biotechnology , biochemistry , genetics
The cellular localization of acetylcholinesterase (ACHE) was investigated at the electron microscope (E.M.) in a neuroblastoma and neuroblastoma × glioma hybrid line, which differ for their ability to establish synaptic contacts. Only cells of the latter line show association of AChE to the plasmamembrane, while in the former the activity is mainly intracellular. Sucrose sedimentation analysis of AChE molecular forms has shown no significant differences in the distribution of the two forms, G 2 and G 4 , between the two cell lines. On the contrary a marked difference is observed in the ability of the cell to release the enzyme in the culture medium. In fact the cells lacking AChE on their surface release in the medium a much higher proportion of their enzyme, than the cells showing AChE association to their plasmamembrane. The possible role of two alternative fates for AChE, secretion or membrane insertion, in determining the observed differences of enzyme localization is discussed.